DVL-Digest 590 - Postings: Index "Mixing 16:9 and 4:3" before I pull hte trigger Before I pull the trigger... dv card compression? query faster than realtime transfer SDI and embedded audio "Mixing 16:9 and 4:3" - "Perry" Since anamorphic 16:9 relies on the display device to switch aspect ratio, and this is done by a flag in the signal, you cannot have a mixture of aspect ratios in the same project. Most folk convert the 16:9 to letterbox and make the whole project 4:3, but there is nothing to stop you converting the 4:3 to 'pillarbox' and do the project in 16:9. Perry Mitchell Video Facilities http://www.perrybits.co.uk/ before I pull hte trigger - "Perry" I'm just testing a Fast Purple product for a magazine review. This is supplied as a turnkey system installed on a twin processor Windows NT workstation. It's early doors for conclusions but I am VERY impressed with it's use of the processing power, and the twin monitor system works well also. I would want to be sure that Speed Razor and Premiere both made similar full use of the dual processors. Purple can use Premiere plug-ins. There are optional control panel and rendering acceleration board. Purple is a dedicated DV system, but Silver includes analog interfaces. Perry Mitchell Video Facilities http://www.perrybits.co.uk/ Before I pull the trigger... - Adam Wilt Please give me a sanity check before I drop twenty grand.... > > Matrox DigiSuite DTV with 1394 option. (I plan to pass on the BOBs and > the MAX option.) Nice choice. Works with NT4 only, at present, though Win2K compatibility is about to enter beta testing. I've found it quite solid, though do make sure your integrator works out the bugs; DSDTV is rather sensitive to the motherboard used (which is why you go with a VAR instead of doing it yourself, of course!). The 1394 option is the same old Adaptec 8945 we all know and love (?); it's the least robust part of the system and is scheduled to be replaced by the MAX option (which, BTW, you should keep your options open on; when it ships it should offer realtime playout to 1394 without rendering -- currently the DTV, like the RT2000, must render the timeline if you want to play out 1394. IMHO the DTV won't really be completely functional until MAX ships). I also lack the BOBs and thus I have a huge rat's nest of connectors hanging off the back of the machine. The XLRs especially bulk it up. After connecting cables to my router and audio mixer I wrapped the mess in plastic and suspended it on a bit of cord to relieve stress on the connectors. Ugly, but it works. Most folks who get the BOBs say they are a worthwhile expenditure. BTW, with DV25 streams I'm doing realtime dual channel off of a single IBM IDE drive. With DV50, though, I'd need the RAID for realtime. Cheers, AJW a DV FAQ: http://www.adamwilt.com/DV.html dv card compression? query - Adam Wilt Is there a source of info regarding the varied firewire cards for the Mac. Try Ross Jones' "Golden List". The current version is at http://desktopvideo.about.com/compute/desktopvideo/library/weekly/aa031298.htm Cheers, Adam Wilt a DV FAQ: http://www.adamwilt.com/DV.html faster than realtime transfer - Adam Wilt And you won't be transferring it [DV] faster from the tape device > either, as that is fixed at the NTSC display rate. Transferring from > disk to disk can be faster, but anything to/from tape is fixed. DV25 material is currenty played off tape at 4x realtime using the DVCAM DSR-85 and DSR-2000 VTRs and the high-end Panasonic D-7 VTRs (the model munbers escape me but I'll bet Jan C. can supply 'em!) over their SDTI options (Serial Data Transport Interface; data over a 270 Mbit SDI connection). The transports and electronics have to be able to handle the higher tape speeds and data rates but it is indeed possible, as a variety of news and production houses have profitably learned. Indeed, faster than realtime over 1394 is possible, though no one has implemented it yet. The S100 (100 Mbit/sec) 1394 interfaces on most low-end DV gear should easily handle 2x; S400-capable gear (i.e., Mac G4s) should handle 8x. Cheers, Adam Wilt a DV FAQ: http://www.adamwilt.com/DV.html SDI and embedded audio - Perry Mitchell >Actually Jan, the SMPTE 259 spec talks of the embedded audio. ITU-R601 or CCIR601 all just call out for the video. SDI is an inclusive term and one should be careful in making assumptions. Good for you to bring this up.< AFAIK SMPTE 259 is the spec for SDI, '601 is the spec for Digital Component Video so it is not surprising that it doesn't mention audio! Sony invented SDI with the introduction of a chip set that they sold to interested parties, this included embedded audio and timecode. Some companies later developed their own SDI solutions that didn't include audio/timecode, and SDI wasn't a 'standard' as such until later. The bottom line is if you want to feed a Digital Video Recorder with all the signals down a single BNC co-ax, you need embedded audio and timecode. (diese posts stammen von der DV-L Mailingliste - THX to Adam Wilt and Perry Mitchell :-) [up] |
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